Method of Assessing Probable Fire Endurance of Load-Bearing Columns


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Title: Method of Assessing Probable Fire Endurance of Load-Bearing Columns

Author(s): J. H. Clarke

Publication: Journal Proceedings

Volume: 56

Issue: 6

Appears on pages(s): 1223-1242

Keywords: none

Date: 6/1/1960

This paper gives two methods of assessing the probable fire endurance of load-bearing reinforced concrete columns subjected to the standard fire resistance test. A column during a test may support a load well below the per-missible design load and therefore the fire endurance period may be expected to exceed the fire resistance rating allocated according to the size of the column, thickness of the cover, reinforcement, and the load. The suggestion is tentatively put forward that designers may be permitted to design a column according to the load carried, including a safety factor. Then. they may modify the design by the methods given in this paper if the requisite fire resistance is not obtained. The column sizes dealt with are 15 x 1 S-in. to PO x PO-in. as this range of column sizes occurs frequently in design practice and information on the smaller sizes is more readily obtainable.